Frequencies for first 10,000 rows of drugres3 variable in person dataset :

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,872       98.72       98.72
        155 |          1        0.01       98.73
        165 |          1        0.01       98.74
        177 |          1        0.01       98.75
        187 |          1        0.01       98.76
        189 |          3        0.03       98.79
        196 |          1        0.01       98.80
        304 |          1        0.01       98.81
        321 |          5        0.05       98.86
        343 |          1        0.01       98.87
        348 |          2        0.02       98.89
        351 |          4        0.04       98.93
        376 |          2        0.02       98.95
        401 |         10        0.10       99.05
        402 |          4        0.04       99.09
        405 |          1        0.01       99.10
        407 |          6        0.06       99.16
        410 |         16        0.16       99.32
        417 |         19        0.19       99.51
        513 |          1        0.01       99.52
        514 |          1        0.01       99.53
        600 |          4        0.04       99.57
        603 |          5        0.05       99.62
        606 |          3        0.03       99.65
        695 |          9        0.09       99.74
        996 |         24        0.24       99.98
        999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016